Both Anthony and Lopez, 42, was photographed hanging by the pool with their 3-year-old twins Emme and Max at the sprawling Florida home they once shared. The couple announced the end of their seven-year marriage back in July. See more pictures from Marc's birthday.

Lopez, on a break from filming What to Expect When You're Expecting, kept it casual in a blousey white top, shorts, wedges and oversized sunglasses.

The night before, after performing an emotional, sold-out show, the newly-single Anthony partied with about 150 pals at Club 50 (at Miami's Viceroy hotel) -- sipping champagne and beer and chowing down on a birthday cake made by Ace of Cake's Geof Manthorne.

At the bash, Anthony told Us Weekly about his fave b-day present: "Being with my family yesterday, spending time with my kids."